JPH10320886A - Double loading preventing device of recording medium in recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a recording medium from double loading within a recording/reproducing device. SOLUTION: The inserting opening 3 freely inserting the recording medium 2 is formed in a panel 1 and the carrying device 7 of the recording medium 2 is arranged in the back side of the panel 1. A shutter 11 is turnably provided around a left and right directional supporting axis 19 between the inserting opening 3 and the carrying device 7, and the shutter 11 is (1) freely changed into the closed attitude orthogonal to the transferring path of the recording medium 2, (2) the backward releasing attitude releasing the transferring path of the recording medium 2 in the back side of the closed attitude and (3) the forward releasing attitude releasing the transferring path of the recording medium 2 in the forward side of the closed attitude. Also, (A) the holding spring 12 holding shutter 11 in the closed attitude and (B) the cam mechanism 13 allowing only the forward turning of the shutter 11 when shutter 11 is changed from the backward releasing attitude into the closed attitude are provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for preventing double loading of a recording medium in a recording / reproducing apparatus.

[0002]

2. Description of the Related Art A recording / reproducing apparatus for recording / reproducing a card-shaped recording medium such as an optical card or a magnetic card includes FIGS.
There is one shown in FIG. In this device, the panel 41
In addition, an insertion opening 43 into which a recording medium 42 is removably inserted is formed, and a shutter 45 that rotates around a support shaft 44 in the left-right direction is provided behind the panel 41.
The photo sensor 46 for detecting the insertion of the second and the upper and lower transport rollers 47 and 48 are disposed rearward in the above order. The support shaft 44 of the bracket 52
The insertion hole 53 is a long hole.

The shutter 45 is unstablely switched and held by a switching spring (holding spring) 49 between an open position shown in FIGS. 11 and 12 and a closed position shown in FIG.
The shutter 45 has a closing portion 50 and an operating portion 51 having the same shape, and these are separated by 90 ° in the circumferential direction about the support shaft 44. 11 and FIG.
When the shutter 45 is in the open position, the closing portion 50 is in a horizontal position in front of the support shaft 44, and the operating portion 51 is in a vertical position above the support shaft 44. In the closed position of the shutter 45, as shown in FIG. 14, the closing portion 50 is in a vertical position above the support shaft 44, and is orthogonal to the moving path of the recording medium 42. 51 is in a horizontal posture in front of the support shaft 44.

Before the recording medium 42 is loaded, the shutter 45 is in an open position as shown in FIGS. In this state, when the recording medium 42 is inserted from the insertion opening 43, the recording medium 42 presses the operating portion 51 against the switching spring 49 and rotates backward, and as shown in FIG. The upper and lower transport rollers 47 and 4 are provided between the upper and lower ends of the photo sensor 46 while the operating portion 51 is in the upwardly inclined position while the operating portion 50 is in the upwardly inclined position.
Enter between eight.

As a result, the photo sensor 46 detects the recording medium 42, and the upper and lower transport rollers 47 and 48 are driven.
2 is conveyed backward and loaded into the recording / reproducing position.
When the recording medium 42 passes backward through the shutter 45 as described above, the switching spring 49
5 is unstablely switched to the closed position shown in FIG. In this state, when the recording medium 42 is reinserted from the insertion port 43 as shown by the imaginary line in FIG. 14, the recording medium 42 presses the closing portion 50 of the shutter 45 backward, Since the rotation is prevented, the insertion of the recording medium 42 is prevented, and the double loading of the recording medium 42 is prevented.

Then, the recording / reproducing unit (not shown) applies to the recording medium 42 loaded at the recording / reproducing position.
When recording / reproduction is performed and the recording / reproduction is completed and the recording medium 42 is ejected from the insertion opening 43 to the front of the panel 41, the upper and lower transport rollers 47 and 48 are driven to rotate, and the recording medium 42 is moved forward. Transported to During this transfer, the switching spring 4
13, the recording medium 42 presses the closing part 50 and rotates it forward, and as shown in FIG. Is transported forward and sent out of the insertion slot 43 to the outside. Then, when the recording medium 42 is taken out from the insertion opening 43, the shutter 45 is unstablely switched to the open position shown in FIG.

[0007]

As described above, conventionally, the shutter 45 has the operating portion 51 and the closing portion 50 which are separated from each other by 90 ° in the circumferential direction. Is in a horizontal position in front of the support shaft 44, and the closing portion 50 is in a closed position of the shutter 45.
Is in a horizontal position behind the support shaft 44, so that a space in which the operation unit 51 and the closing unit 50 can be positioned in a horizontal position before and after the support shaft 44 is provided as an operation space in the front-rear direction of the shutter 45. Need to be secured,
The length of the operating space for the shutter 45 in the front-rear direction was long.

For this reason, the photo sensor 46 and the transport rollers 47 and 48 cannot be disposed close to the panel 41. Therefore, after the recording / reproduction of the recording medium 42 is completed,
The transporting rollers 47 and 48 do not allow the recording medium 42 to be largely sent forward from the insertion port 43, so that the amount of projection of the recording medium 42 from the insertion port 43 becomes small,
There is a problem that it is difficult to remove the recording medium 42 from the insertion opening 43.

According to the present invention, a recording / reproducing apparatus which allows a recording medium to be largely sent forward from an insertion slot, increases the amount of projection of the recording medium from the insertion slot, and facilitates removal of the recording medium from the insertion slot. It is an object of the present invention to provide a device for preventing double loading of a medium.

[0010]

Means for Solving the Problems To achieve the above object, the present invention is characterized in that a panel is provided with an insertion opening through which a recording medium is removably inserted. The recording medium inserted from the insertion port is transported to a recording / reproducing position behind the panel, and the recording medium at the recording / reproducing position is provided with a transport device for sending the recording medium forward of the panel from the insertion port. A shutter is provided between the opening and the transport device so as to be rotatable around a support shaft in the left-right direction. The shutter has a closing posture orthogonal to the moving path of the recording medium, and a moving path of the recording medium on the rear side of the closed posture. The posture can be freely changed to a rear opening posture in which the recording medium is opened on the front side of the closing posture, and a front opening posture in which the moving path of the recording medium is opened in front of the closing posture. B. biasing means for holding the shutter in a closed position; The point is that a shutter control mechanism that allows only the frontward rotation of the shutter when the posture of the shutter changes from the rear open posture to the closed posture is provided. The shutter control mechanism is a cam mechanism, and includes a follower that rotates integrally with the shutter, and a cam body that is rotatable about a holding axis parallel to the support shaft. A cam groove is formed to movably engage the cam groove, and the cam groove moves in a process of shifting the shutter from the closed position to the rear open position, and a first moving path along which the follower moves, and the shutter moves from the rear open position to the closed position. The second movement path in which the follower moves in the process of shifting to the third position, in which the follower moves in the process of shifting the shutter from the closed position to the forward open position.
A moving path, and a fourth moving path in which the follower moves in a process of shifting the shutter from the front open position to the closed position,
The first to fourth moving paths may be connected in a ring in the above order. Further, the follower is urged against the bottom surface of the cam groove, and comes into contact with the bottom surface so as to be able to advance or retreat, or to be able to separate from the bottom surface. There may be a case where a retrograde preventing portion which falls in a substantially depth direction is formed in each of the connection portion, the connection portion on the bottom surface of the second and third movement paths, and the connection portion on the bottom surface of the third and fourth movement paths. Further, on the bottom surfaces of the first to third moving paths of the cam groove, an inclined surface whose depth becomes shallower toward the front in the moving direction of the follower is formed, and the depth of the start end and the end of each moving path is formed. In some cases may be substantially the same as the drop amount of each of the retrograde prevention units. Note that, in the claims, the left-right direction is set for convenience of description according to the following embodiment of the present invention, but this is only for convenience, and the “left-right direction” is set according to the use posture of the device. May be “vertical direction”, and the present invention does not limit the above direction.
Further, in the present invention, “recording / reproducing” means “recording” and / or “reproducing”.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment in which the present invention is applied to a recording / reproducing apparatus for recording / reproducing a card-shaped recording medium will be described below with reference to FIGS. On the front surface, a horizontally long insertion slot 3 into which the recording medium 2 is inserted so as to be able to be inserted and removed is formed. Behind the panel 1 (inside the panel 1), a shutter device 5, a substantially U-shaped photo sensor 6 for detecting the recording medium 2 inserted from the insertion slot 3, a transport device 7, and a recording / reproducing unit 8 are arranged in the above order toward the rear of the panel 1 (the front in the insertion direction of the recording medium 2).

The shutter device 5 is disposed between the insertion slot 3, the photo sensor 6, and the transport device 7, and includes a pair of left and right standing plates 10, a shutter 11, a pair of left and right holding springs 12, It has a pair of left and right cam mechanisms 13 and the like.

Each erected plate 10 is erected from a chassis (not shown), has a planar shape in the left-right direction, and is located on both left and right sides of the moving path of the recording medium 2. From the upper part of each standing plate 10, a pair of left and right holding shafts 15 project inward, respectively.

A shutter (insertion preventing plate) 11 prevents double loading of the recording medium 2, and has a main body 17 having a planar shape in the front-rear direction, and is fixed to the front surface of the main body 17 and lower than the main body 17. And a protruding plate 18 protruding therefrom. A pair of left and right support shafts 19 protrude from the left and right side ends of the upper end of the main body 17 to the left and right sides, respectively.
The shutter 11 is rotatable around the support shaft 19 by being supported at the vertical intermediate portion of each standing plate 10,
As shown in FIGS. 2 and 6, a closed position orthogonal to the movement path of the recording medium 2, and as shown in FIG. 5, a rear open position opening the movement path of the recording medium 2 on the rear side of the closed position,
As shown in FIG. 7, the posture can be freely changed from a closed posture to a front open posture in which the movement path of the recording medium 2 is opened on the front side. Each support shaft 19 is located below each holding shaft 15, and both shafts 15, 19 are located at the same position in the front-back direction. A pair of left and right hooking pieces 20 project upward from both left and right ends of the upper end of the main body 17. In a side view, the projecting direction of the hooking pieces 20 from the support shaft 19 and the The projecting direction from the support shaft 19 is
The opposite is true. A hook shaft 21 projects outward from the tip of each hook piece 20.

The holding spring 12 is exemplified as a biasing means, and is interposed between each corresponding holding shaft 15 and the hooking piece 20 in a resilient manner to hold the shutter 11 in a closed posture. In addition, as a biasing means, a fluid pressure cylinder or the weight of the shutter 11 may be used in addition to the spring.

The cam mechanism 13 is exemplified as a shutter control mechanism, and allows only the forward rotation of the shutter 11 when the posture of the shutter 11 is changed from the rear open posture to the closed posture. Each cam mechanism 13 includes a holding piece 2
2, a follower 23, a cam body 24 and the like. Note that a mechanism other than the cam mechanism 13 may be used as the shutter control mechanism.

The holding piece 22 is attached to the main body 17 of the shutter 11.
, Projecting rearward from both left and right end portions of the upper end portion, the protruding direction from the support shaft 19 is the protruding direction of the hooking piece 20 from the support shaft 19 and the protruding direction of the main body 17 from the support shaft 19. Is just in the middle direction. Holding piece 22
Is made of an elastic material such as a leaf spring having a planar shape in the left-right direction, and is capable of swinging in the left-right direction by elastic deformation.
3 protrudes outward.

The cam body 24 is formed in an elongated plate shape in the up-down direction, has a planar shape on both left and right sides, and has an upper end pivotally supported by the holding shaft 15 to rotate around the holding shaft 15 in the front-rear direction. It is free. The holding shaft 15 may be provided on the cam body 24 in some cases. An annular cam groove 26 opening inward is formed in the cam body 24, and the holding piece 2 is formed in the cam groove 26.
2 is swung slightly inward, the follower 23 is movably engaged, and the follower 23 comes into contact with the bottom surface of the cam groove 26 so as to be able to separate or move forward and backward. Close to.

The cam groove 26 moves during the transition from the closed position of the shutter 11 to the rearward open position, the first moving path 26A where the follower 23 moves, and during the transition of the shutter 11 from the rearward open position to the closed position. The second moving path 26B in which the follower 23 moves, the third moving path 26C in which the follower 23 moves in the process of shifting the shutter 11 from the closed position to the forward open position, and the shutter 11 is closed from the forward open position. In the process of shifting to the posture, there is a fourth moving path 26D on which the follower 23 moves, and the first to fourth moving paths 26D
A to 26D are connected in a ring in the above order. These moving paths 26A to 26D have (substantially) the same length. In addition, in the above-mentioned ~, "... of the shutter 11 ...
In the transition process from the posture to the posture ", the transition process does not include the latter posture. In other words, the transition process includes the former posture to the latter immediately preceding posture.

The depth of the first moving path 26A is constant with respect to the moving direction of the follower 23. On the other hand, the bottom surfaces of the second to fourth moving paths 26B to 26D are
In the moving direction, the depth is gradually reduced as going forward, and the inclination angles of the bottom surfaces are (substantially) the same. In addition, the inclination angles of the bottom surfaces of the second to fourth moving paths 26B to 26D may not be (substantially) the same. Also, instead of making the entire bottom surface of each of the second to fourth moving paths 26B to 26D an inclined surface, only a part thereof is made an inclined surface, or
Two or more inclined surfaces may be formed. 1st, 2nd
Connecting portions on the bottom surfaces of the moving paths 26A and 26B, connecting portions on the bottom surfaces of the second and third moving paths 26B and 26C, and third and fourth portions.
The first to third reverse movement preventing portions 26E to 26 that fall in the (substantially) depth direction are provided at the connection portions on the bottom surfaces of the moving paths 26C and 26D.
G is formed, and each of the first to third reverse movement preventing portions 26E to 26G is formed.
Is set to (substantially) the same as the difference in depth between the start and end of each of the second to fourth moving paths 26B to 26D.

The transport device 7 detects the recording medium 2 from the photo sensor 6 and detects the recording medium 2 inserted from the insertion slot 3.
To the recording / reproducing position behind the panel 1 (inside the panel 1 and in the inserting direction of the recording medium 2), and after the recording / reproducing is completed, the recording medium 2 at the recording / reproducing position is moved from the insertion slot 3 to the panel. 1 forward (outside the panel 1 and rearward in the insertion direction of the recording medium 2), a pair of left and right upper transport rollers 28 disposed in the left and right direction, and a lower transport roller 29 disposed in the left and right direction. Upper and lower transport rollers 2
It is composed of a drive motor (not shown) for rotating one or both of the motors 8 and 29 or the like. Note that a transport belt or the like may be used instead of the transport roller.

The recording / reproducing section 8 performs recording / reproducing of the recording medium 2 in a state where the recording medium 2 is located at the recording / reproducing position, and includes, for example, upper and lower mechanisms 31, 32 and the like. I have.

In the first example constructed as described above, before the recording medium 2 is loaded into the recording / reproducing position, the shutter 11 is closed by the holding spring 12 in the vertical posture as shown in FIG. And is orthogonal to the moving path of the recording medium 2. The follower 23 of each cam mechanism 13 is located at the start end of the first moving path 26A of the cam groove 26.

In this state, as shown in FIG. 4, when the recording medium 2 is inserted from the insertion opening 3 to the rear of the panel 1, the recording medium 2 presses the shutter 11 and opposes the holding spring 12,
The shutter 11 is rotated rearward around the support shaft 19 so as to be in the rearward open position shown in FIG. 5, and the shutter 11 closes the moving path of the recording medium 2. Further, the follower 23 causes the cam body 24 to move the holding shaft 15
While rotating backward around the cam groove 26, the first moving path 26A of the cam groove 26 moves upward to reach the start end of the second moving path 26B. At this time, the follower 23 is connected to the first moving path 2 of the cam groove 26.
After sliding on the inclined bottom surface of 6A, the holding piece 22
The first reverse movement preventing portion 26E is elastically deformed outward.
(Substantially) in the depth direction to reach the start end of the second moving path 26B.

In this manner, after the recording medium 2 has the shutter 11 in the rear open position, the recording medium 2 slides between the upper and lower ends of the photosensor 6 and the upper and lower transport rollers 28 while sliding with the lower end of the shutter 11. It is inserted between 29. As a result, the photo sensor 6 detects the recording medium 2 and the conveying device 7 is driven, and the recording medium 2 is conveyed rearward by the upper and lower conveying rollers 28 and 29, as shown in FIG. It is loaded in the recording / reproducing position, that is, the recording / reproducing section 8.

When the rear end of the recording medium 2 passes behind the shutter 11 during the conveyance, the holding spring 12
The shutter 11 pivots forward and assumes the closed position shown in FIG. Also, by changing the position of the shutter 11,
The follower 23 moves downward from the start end of the second moving path 26B of the cam groove 26 while rotating the cam body 24 forward. At this time, the backward movement to the first moving path 26A is performed by the first moving path 26A. The movement is blocked by the reverse movement preventing portion 26E, moves downward on the second moving path 26B, and reaches the start end of the third moving path 26C. At this time, the follower 23 slides on the inclined bottom surface of the second moving path 26B of the cam groove 26 to move the holding piece 22 inward while elastically deforming the holding piece 22 inward. While elastically deforming the piece 22 outward, the piece 22 falls (substantially) in the depth direction at the second reverse movement preventing portion 26F, and reaches the start end of the third moving path 26C.

As described below, even when the follower 23 moves on the third and fourth moving paths 26C and 26D, the follower 23 slides on the inclined bottom surfaces of the moving paths 26C and 26D to hold the same. Piece 22
Is elastically deformed inward. Note that the follower 23 is
In some cases, the bottom surfaces of the fourth moving paths 26B to 26D are floated from the bottom surface without sliding the front surface.

After the loading of the recording medium 2 into the recording / reproducing position, as shown by the imaginary line in FIG.
Presses the shutter 11 in the closed position and attempts to rotate the shutter 11 rearward. As a result, the follower 23 moves upward from the starting end of the third moving path 26C of the cam groove 26, that is,
The shutter 11 does not rotate backward because the reverse movement is prevented by the second reverse movement preventing portion 26F, but the insertion of the recording medium 2 is prevented, and double loading is prevented. Is done.

Then, recording / reproduction is performed by the recording / reproduction unit 8 on the recording medium 2 loaded at the recording / reproduction position, and after this, the recording medium 2 is discharged from the insertion slot 3 to the front of the panel 1. The upper and lower transport rollers 2
The recording media 2 are conveyed forward by rotating the recording media 8 and 29.

By this conveyance, the recording medium 2 presses the shutter 11 and rotates forward against the holding spring 12 so that the recording medium 2 is brought to the front open position shown in FIG. Unblock the route. In addition, the follower 23 moves downward from the start end of the third movement path 26C of the cam groove 26 while rotating the cam body 24 forward by the above-described posture change of the shutter 11, and the fourth movement path 26
It reaches the beginning of D. In this way, after the recording medium 2 sets the shutter 11 to the front open position,
It moves forward while sliding with the lower end of the, and is sent out from the insertion opening 3 as shown in FIG.

Then, as shown in FIG. 8, when the recording medium 2 is taken out from the insertion slot 3, the shutter 11 is rotated backward by the holding spring 12, and is brought into the closed posture. Further, the follower 23 moves upward from the start end of the fourth moving path 26D of the cam groove 26 while rotating the cam body 24 backward by the above-described posture change of the shutter 11, but the third moving path 26C Is stopped by the third reverse movement prevention unit 26G, and moves upward along the fourth moving path 26D, and the first moving path 2D.
It reaches the beginning of 6A.

Incidentally, the length from the support shaft 19 of the present invention to the tip of the shutter 11 is the same as the length from the support shaft 44 of the conventional example to the tip of the closing portion 50 or the operating portion 51 shown in FIGS. When the present invention is compared with the conventional example as the length L, in the conventional example, as shown in FIG. 12 and FIG. It is necessary to secure L.

On the other hand, in the present invention, the shutter 11
Is made to be a single flat plate, and is rotated back and forth by an angle for opening the movement path of the recording medium 2 from the closed posture of the vertical posture. Then, it is only necessary to secure only the length of Lsinα before and after the support shaft 19 as the working space in the front-back direction of the shutter 11, and the working space in the front-back direction of the shutter 11 is 2L.
(1−sin α) can be shorter than the conventional example. Therefore, the photo sensor 6 and the transport device 7 are
It can be arranged close to the panel 1, that is, the insertion slot 3.
Therefore, when the recording medium 2 is discharged to the outside of the panel 1, the recording medium 2 can be largely sent out from the insertion port 3, and the amount of protrusion of the recording medium 2 from the insertion port 3 can be increased. Can be easily removed from

Further, if the first to third reverse movement prevention units 26
In a state where E to 26G exist, the second to fourth moving paths 26
Assuming that the depth of B to 26D is constant, the later traveling path is,
Since the depth increases, the amount of movement of the follower 23 following the bottom surface of the moving paths 26A to 26D in the left-right direction and the amount of swing of the holding piece 22 in the left-right direction become considerably large, and the sliding of the follower 23 The movement (operation) and the swinging (operation) of the holding piece 22 may not be performed smoothly. In particular, in the above case, the first
It is necessary to form a steeply inclined surface on the bottom surface of the moving path 26A, and there is a high possibility that the follower 23 will not slide smoothly on this steeply inclined surface. Further, as described above, in order to increase the amount of swing of the holding piece 22 in the left-right direction, the length of the holding piece 22 needs to be increased, and there is a problem that the apparatus becomes larger accordingly.

On the other hand, in the present invention, the bottom surfaces of the second to fourth moving paths 26B to 26D of the cam groove 26 are
And the depth of the beginning and end of each of the second to fourth moving paths 26B to 26D is reduced by the inclination of the first to third retrograde movements. Prevention unit 26
Since the drop amounts of E to 26G are (substantially) the same, as described above, the follower 23 that follows the bottom surface of the moving paths 26A to 26D does not become deeper as the latter moving path.
Of the holding piece 22 in the left-right direction and the amount of swing of the holding piece 22 in the left-right direction can be reduced. Therefore, the sliding (operation) of the follower 23 and the swinging (operation) of the holding piece 22 can be smoothly and smoothly performed, and the length of the holding piece 22 can be reduced, so that the apparatus can be made compact.

In the present invention, since the shutter 11 is rotated by the recording medium 2 and the holding spring 12, it is not necessary to provide an electromagnetic actuator such as a solenoid as a driving device for the shutter 11, and the present invention is not limited thereto. The invention can be implemented at low cost.

FIGS. 9 and 10 show a second embodiment of the present invention, in which the recording medium 2 comprises a cartridge 35 and a disk 36 housed in the cartridge 35.
The recording / reproducing unit 8 for recording / reproducing the recording medium 2 includes a transport device (not shown) for the recording medium 2 and a recording medium 2.
Is also provided. The operation of the second example configured as described above is substantially the same as that of the first example, and a description thereof will be omitted.

In the above embodiment, the present invention is applied to a recording / reproducing apparatus for a card-shaped recording medium or a disk-shaped recording medium, but the present invention is applied to a recording / reproducing apparatus for other recording media. Is also applicable.

[0039]

As described in detail above, according to the present invention,
The working space in the front-rear direction of the shutter can be made shorter than before, and the transfer device can be arranged closer to the panel than before. Therefore, when the recording medium is discharged to the outside of the panel, the recording medium can be largely sent out from the insertion port, and the amount of protrusion of the recording medium from the insertion port can be increased.
The recording medium can be easily taken out from the insertion slot.

According to the second aspect, it is possible to prevent the follower from going backward in the cam groove. According to the third aspect, the amount of movement of the follower in the left-right direction can be reduced, and accordingly, the follower can be operated smoothly and smoothly, and the device can be made compact.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first example of an embodiment of the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is an enlarged view and a developed sectional view of the cam groove of FIG. 2;

FIG. 4 is an operation state diagram of FIG. 2;

FIG. 5 is an operation state diagram of FIG. 2;

FIG. 6 is an operation state diagram of FIG. 2;

FIG. 7 is an operation state diagram of FIG. 2;

FIG. 8 is an operation state diagram of FIG. 2;

FIG. 9 is a perspective view showing a second example of the embodiment of the present invention.

FIG. 10 is a vertical sectional view of FIG. 9;

FIG. 11 is a perspective view showing a conventional example.

FIG. 12 is a vertical sectional view of a main part of FIG. 11;

FIG. 13 is an operation state diagram of FIG.

FIG. 14 is an operation state diagram of FIG.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 panel 2 recording medium 3 insertion slot 5 shutter device 7 transport device 8 recording / reproducing unit 11 shutter 12 holding spring 13 cam mechanism 15 holding shaft 19 support shaft 23 follower 24 cam body 26 cam groove 26A to 26D first to fourth Moving path 26E-26G First-third reverse movement prevention unit

Claims (4)

[Claims] 1. An insertion slot through which a recording medium is removably inserted is formed in a panel. A recording medium inserted through the insertion slot is conveyed to a recording / reproducing position behind the panel. And a transport device for sending a recording medium at a recording / reproducing position from the insertion port to the front of the panel, wherein a shutter is provided between the insertion port and the transport device so as to be rotatable about a left-right support shaft. And the shutter opens the closing position orthogonal to the moving path of the recording medium, the rear opening position that opens the moving path of the recording medium on the rear side of the closing position, and opens the moving path of the recording medium on the front side of the closing position. The posture can be freely changed to a forward open posture to perform A. B. biasing means for holding the shutter in a closed position; When the shutter is changed from the rear open position to the closed position, a shutter control mechanism is provided that allows only the forward rotation of the shutter.
A device for preventing double loading of a recording medium in a playback device. 2. A shutter control mechanism comprising a cam mechanism, comprising a follower rotating integrally with the shutter, and a cam body rotatable about a holding axis parallel to the support shaft. A cam groove in which the follower is movably engaged; a cam groove in which the follower moves during a transition from the closed position of the shutter to the rear open position; and a rear open position of the shutter. A second moving path in which the follower moves in the process of shifting from the closed position to the closed position; a third moving path in which the follower moves in the process of shifting from the closed position of the shutter to the forward opening position; and a forward opening position of the shutter. 2. The recording / reproducing apparatus according to claim 1, further comprising: a fourth moving path on which the follower moves in the process of shifting from the closed position to the closed position, wherein the first to fourth moving paths are annularly connected in the above order. Device for preventing double-loading of recording media. 3. A follower is urged against the bottom surface of the cam groove and abuts against the bottom surface so as to be able to advance or retreat, or to be separated from the bottom surface, and the first and second moving paths in the cam groove. Connection part on the bottom of the
3. The recording / reproducing apparatus according to claim 2, wherein a reverse movement preventing portion which falls substantially in a depth direction is formed at each of the connection portions on the bottom surfaces of the second and third movement paths and the connection portions on the bottom surfaces of the third and fourth movement paths. A device for preventing double loading of a recording medium in a playback device. 4. An inclined surface whose depth becomes shallower as it goes forward in the moving direction of the follower, and is formed on the bottom surface of the first to third moving paths of the cam groove. 4. The double loading prevention device for a recording medium in a recording / reproducing apparatus according to claim 3, wherein the difference in the depth of the recording medium is substantially the same as the amount of drop of each of the reverse movement preventing portions.